Hekinan Seaside Aquarium, Public aquarium in Rinkai Park, Japan

Hekinan Seaside Aquarium opened on 4 July 1982 in Hekinan Seaside Park, Hama-machi. The two-storey reinforced-concrete building holds the aquarium on the ground floor and the Hekinan Youth Sea Science Museum upstairs; together they are called Hekinan Marine Dome. The aquarium displays about 300 species and 4,000 fish from the Japanese coast, including species of the Yahagi River, Ise Bay and Mikawa Bay.

The facility was established in 1982 as a marine education center for the local area. It has grown to become an important place where people learn about ocean life and coastal ecosystems.

The place shows how people in the region connect with the ocean and its creatures through hands-on displays. Visitors can learn about the fishing traditions and marine life that have shaped local life for generations.

The aquarium opens daily from 9:00 to 17:00, staying open until 18:00 during the summer holidays, and closes on Mondays unless Monday is a public holiday, in which case it closes the following day. It is about a 15-minute walk from Meitetsu Mikawa Line's Hekinan Station, or reachable by the Kuru Kuru bus to the Kaihin Suizokukan stop. The science museum on the second floor is free.

The second floor houses the Hekinan Youth Sea Science Museum, entered free of charge, with the theme "Water — from forest to sea" and quiz-rally exhibits. The building, called Hekinan Marine Dome together with the aquarium, opened on 4 July 1982.